<?xml version="1.0" encoding="UTF-8"?>
<!-- Copyright 2007 XBRL International. All Rights Reserved.  
 
This version is non-normative - it should be identical to the normative version that is contained in Appendix A of the relevant specification except for this comment.

Following the schema maintenance policy of XBRL International, it is the intent (but is not guaranteed) that the location of non-normative versions of these schemas on the web will be as follows:

1)	While any schema is the most current RECOMMENDED version and until it is superseded by any additional errata corrections a non-normative version will reside on the web in the directory http://www.xbrl.org/2008/ - during the drafting process for this specification this directory should contain a copy of the most recent published version of the schema at http://www.xbrl.org/2008/formula.xsd.

2)	A non-normative version of each schema as corrected by any update to the RECOMMENDATION will be archived in perpetuity on the web in a directory that will contain a unique identification indicating the date of the update.

-->
<schema 
  targetNamespace="http://xbrl.org/2008/formula"
  elementFormDefault="qualified"
  xmlns="http://www.w3.org/2001/XMLSchema" 
  xmlns:formula="http://xbrl.org/2008/formula"
  xmlns:variable="http://xbrl.org/2008/variable" 
>

  <import namespace="http://xbrl.org/2008/variable" 
    schemaLocation="variable.xsd"/>

  <complexType name="qname.model">
    <choice>
      <element name="qname" type="QName"/>
      <element name="qnameExpression" type="variable:expression"/>
    </choice>
  </complexType>

  <element id="xml-formula"
  name="formula" 
  substitutionGroup="variable:variableSet">
    <complexType mixed="true">
      <complexContent mixed="true">
        <extension base="variable:variableSet.type">
          <sequence>
            <choice minOccurs="0">
              <element name="precision" type="variable:expression" />
              <element name="decimals" type="variable:expression" />
            </choice>
            <element ref="formula:aspects" minOccurs="0" maxOccurs="unbounded"/>
          </sequence>
          <attribute name="value" type="variable:expression" use="required"/>
          <attribute name="source" type="variable:QName" use="optional"/>
        </extension>
      </complexContent>
    </complexType>
  </element>

  <element id="xml-aspects" 
  name="aspects">
    <complexType>
      <sequence>
        <element ref="formula:abstract.aspect" 
        minOccurs="1" maxOccurs="unbounded"/>
      </sequence>
      <attribute name="source" type="variable:QName" use="optional"/>
    </complexType>
  </element>

  <complexType name="abstract.aspect.type">
    <attribute name="source" type="variable:QName" use="optional"/>
  </complexType>
  
  <element id="xml-abstract-aspect" 
  name="abstract.aspect" 
  abstract="true"
  type="formula:abstract.aspect.type"/>

  <element id="xml-concept"
  name="concept" 
  substitutionGroup="formula:abstract.aspect">
    <complexType>
      <complexContent>
        <extension base="formula:abstract.aspect.type">
          <choice minOccurs="0">
            <element name="qname" type="QName"/>
            <element name="qnameExpression" type="variable:expression"/>
          </choice>
        </extension>
      </complexContent>
    </complexType>
  </element>

  <element id="xml-entity-identifier" 
  name="entityIdentifier"
  substitutionGroup="formula:abstract.aspect">
    <complexType>
      <complexContent>
        <extension base="formula:abstract.aspect.type">
          <attribute name="scheme" type="variable:expression" use="optional" />
          <attribute name="value" type="variable:expression" use="optional" />
        </extension>
      </complexContent>
    </complexType>
  </element>

  <element id="xml-period" 
  name="period" 
  substitutionGroup="formula:abstract.aspect">
    <complexType>
      <complexContent>
        <extension base="formula:abstract.aspect.type">
          <choice minOccurs="0">
            <element id="xml-forever" name="forever">
              <complexType/>
            </element>
            <element id="xml-instant" name="instant">
              <complexType>
                <attribute name="value" type="variable:expression" use="optional" />
              </complexType>
            </element>
            <element id="xml-duration" name="duration">
              <complexType>
                <attribute name="start" type="variable:expression" use="optional" />
                <attribute name="end" type="variable:expression" use="optional" />
              </complexType>
            </element>
          </choice>
        </extension>
      </complexContent>
    </complexType>
  </element>

  <element id="xml-unit"
  name="unit" 
  substitutionGroup="formula:abstract.aspect">
    <complexType>
      <complexContent>
        <extension base="formula:abstract.aspect.type">
          <sequence>
            <element id="xml-multiplyBy" name="multiplyBy" minOccurs="0" maxOccurs="unbounded">
              <complexType>
                <attribute name="measure" type="variable:expression" use="optional" />
                <attribute name="source" type="variable:QName" use="optional"/>
              </complexType>
            </element>
            <element id="xml-divideBy"
            name="divideBy" minOccurs="0" maxOccurs="unbounded">
              <complexType>
                <attribute name="measure" type="variable:expression" use="optional" />            
                <attribute name="source" type="variable:QName" use="optional"/>
              </complexType>
            </element>
          </sequence>
          <attribute name="augment" type="boolean" default="true"/>
        </extension>
      </complexContent>
    </complexType>
  </element>

  <complexType name="abstract.occ.aspect.type">
    <complexContent>
      <extension base="formula:abstract.aspect.type">
        <attribute name="occ" use="required">
          <simpleType>
            <restriction base="token">
              <enumeration value="segment"/>
              <enumeration value="scenario"/>
            </restriction>
          </simpleType>
        </attribute>
      </extension>
    </complexContent>
  </complexType>

  <element id="xml-abstract-occ-aspect"
  name="abstract.occ.aspect"
  abstract="true"
  substitutionGroup="formula:abstract.aspect"
  type="formula:abstract.occ.aspect.type"/>

  <element id="xml-occ-empty"
  name="occEmpty" 
  type="formula:abstract.occ.aspect.type"
  substitutionGroup="formula:abstract.occ.aspect"/>

  <element id="xml-occ-fragments"
  name="occFragments"
  substitutionGroup="formula:abstract.occ.aspect">
    <complexType>
      <complexContent>
        <extension base="formula:abstract.occ.aspect.type">
          <sequence>
            <any minOccurs="0" maxOccurs="unbounded"/>
          </sequence>
        </extension>
      </complexContent>
    </complexType>
  </element>

  <element id="xml-occ-xpath"
  name="occXpath" 
  substitutionGroup="formula:abstract.occ.aspect">
    <complexType>
      <complexContent>
        <extension base="formula:abstract.occ.aspect.type">
	       <attribute name="select" type="variable:expression" use="optional"/>
        </extension>
      </complexContent>
    </complexType>
  </element>

  <element id="xml-abstract-dimension-aspect"
  name="abstract.dimension.aspect"
  substitutionGroup="formula:abstract.aspect"
  type="formula:abstract.dimension.aspect.type"
  abstract="true"/>

  <complexType name="abstract.dimension.aspect.type">
    <complexContent>
      <extension base="formula:abstract.aspect.type">
        <attribute name="dimension" type="QName" use="required"/>
      </extension>
    </complexContent>
  </complexType>

  <element id="xml-explicit-dimension"
  name="explicitDimension" 
  substitutionGroup="formula:abstract.dimension.aspect">
    <complexType>
      <complexContent>
        <extension base="formula:abstract.dimension.aspect.type">
          <choice>
            <element name="member" type="formula:qname.model" minOccurs="0"/>
            <element name="omit" minOccurs="0">
              <complexType/>
            </element>
          </choice>
        </extension>
      </complexContent>
    </complexType>
  </element>

  <element id="xml-typed-dimension"
  name="typedDimension" 
  substitutionGroup="formula:abstract.dimension.aspect">
    <complexType>
      <complexContent>
        <extension base="formula:abstract.dimension.aspect.type">
          <choice minOccurs="0" maxOccurs="1">
            <element name="xpath" type="string"/>
            <element name="value">
              <complexType>
                <sequence>
                  <any minOccurs="1" maxOccurs="1"/>
                </sequence>
              </complexType>
            </element>
            <element name="omit">
              <complexType/>
            </element>
          </choice>
        </extension>
      </complexContent>
    </complexType>
  </element>


</schema>